mips: use nth_page() in place of direct struct page manipulation

__flush_dcache_pages() is called during hugetlb migration via
migrate_pages() -> migrate_hugetlbs() -> unmap_and_move_huge_page() ->
move_to_new_folio() -> flush_dcache_folio().  And with hugetlb and without
sparsemem vmemmap, struct page is not guaranteed to be contiguous beyond a
section.  Use nth_page() instead.

Without the fix, a wrong address might be used for data cache page flush.
No bug is reported. The fix comes from code inspection.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 15fa3e8e3269 ("mips: implement the new page table range API")
Signed-off-by: Zi Yan <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions